How Forces Affect Motion-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
Explore NCERT Solutions for Class 9 science exploration Chapter How Forces Affect Motion Topic Assignments - What Have You Learned? with simple explanations and free ncert solution in English.
Class 9 Science Exploration Exploration Chapter 6 How Forces Affect Motion Friction and Applications of Force
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All Topics Chapter How Forces Affect Motion
- 1. Chapter Review and Key Points
- 2. Characteristics of Force
- 3. Balanced And Unbalanced Force
- 4. Newton - The Law of Motion
- 5. Friction and Applications of Force
- 6. Assignments - What Have You Learned?
Notes
How Forces Affect Motion-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
How Forces Affect Motion
Assignments - What Have You Learned?
Chapter 6. How Forces Affect Motion
This assignment is based on the complete chapter and follows the latest CBSE competency-based assessment pattern. It includes objective, descriptive, application-based, case-study and HOTS questions to strengthen conceptual understanding of force, friction, Newton's laws of motion and momentum.
Chapter Assignment
1. One Word Answer
- A push or pull acting on an object.
- The SI unit of force.
- The instrument used to measure force.
- The combined effect of all forces acting on an object.
- Equal and opposite forces with zero resultant.
- The property by which an object resists a change in its state of motion.
- The force that opposes motion between two surfaces.
- The product of mass and velocity.
- The gravitational force acting on an object.
- The law stated as "For every action, there is an equal and opposite reaction."
2. Fill in the Blanks
- Force is a __________ quantity because it has magnitude and direction.
- The SI unit of force is __________.
- Balanced forces have __________ net force.
- Unbalanced forces produce __________.
- Force is measured using a __________.
- The formula for force is __________.
- The formula for momentum is __________.
- Weight is calculated using the formula __________.
- Friction always acts __________ the direction of motion.
- Action and reaction act on __________ objects.
3. True or False
- Force can change the shape of an object.
- Balanced forces always change the motion of an object.
- Momentum depends on both mass and velocity.
- Mass and weight are the same physical quantities.
- Friction is always harmful.
- Newton's First Law is also called the Law of Inertia.
- Action and reaction act on the same object.
- A body at rest has zero momentum.
- Weight changes with gravity.
- Rolling friction is generally less than sliding friction.
4. Match the Following
| Column A | Column B |
|---|---|
| Force | Push or Pull |
| Balanced Forces | Net Force = 0 |
| Unbalanced Forces | Produce Acceleration |
| Inertia | Resistance to Change |
| Newton's First Law | Law of Inertia |
| Newton's Second Law | F = ma |
| Momentum | p = mv |
| Weight | W = mg |
| Friction | Opposes Motion |
| Newton's Third Law | Action and Reaction |
5. Very Short Answer Questions
- Define force.
- Why is force called a vector quantity?
- State the SI unit of force.
- What is a balanced force?
- What is an unbalanced force?
- Define inertia.
- Write Newton's First Law of Motion.
- State Newton's Second Law of Motion.
- Define momentum.
- State Newton's Third Law of Motion.
6. Short Answer Questions
- Explain the characteristics of force.
- Differentiate between balanced and unbalanced forces.
- Describe the different effects of force with examples.
- Explain the concept of inertia with suitable examples.
- Differentiate between mass and weight.
- Describe the advantages and disadvantages of friction.
- Explain different methods of reducing friction.
- State and explain Newton's Second Law with the formula F = ma.
- Explain momentum and the factors affecting it.
- Explain Newton's Third Law with two everyday examples.
7. Long Answer Questions
- Explain Newton's First, Second and Third Laws of Motion with suitable examples.
- Describe the concept of force and its effects on the motion of an object.
- Explain balanced and unbalanced forces with real-life applications.
- Discuss friction, its advantages, disadvantages and methods of reducing it.
- Explain momentum, its formula, SI unit and practical applications.
- Differentiate between mass, weight and momentum.
- Discuss the applications of Newton's laws in everyday life.
- Explain why force is considered a vector quantity.
- Describe how force and momentum are related.
- Explain the importance of friction in transportation and sports.
8. Case Study Questions
Case Study – 1
A football lying on the ground is kicked by a player and starts moving towards the goal.
- Which force starts the motion of the football?
- Are the forces balanced or unbalanced?
- Which law explains the change in motion?
- What happens to the momentum of the ball after it is kicked?
Case Study – 2
A passenger standing inside a bus moves backward when the bus starts suddenly.
- Name the property responsible for this effect.
- Which law of motion explains this situation?
- What type of inertia is observed?
- How can this effect be reduced?
Case Study – 3
A cricket player pulls his hands backward while catching a fast-moving ball.
- Which law of motion explains this action?
- Why does the player move the hands backward?
- How does this reduce the force of impact?
- How is momentum involved in this situation?
Case Study – 4
A loaded truck and a motorcycle are moving with the same speed on a highway.
- Which vehicle has greater momentum?
- Why?
- Which vehicle requires more force to stop?
- State the formula for momentum.
Case Study – 5
A swimmer pushes water backward with his hands and moves forward.
- Which law of motion explains this?
- Identify the action force.
- Identify the reaction force.
- Give one more example based on the same law.
9. Competency-Based Questions
- Why is force required to change the motion of an object?
- How can balanced forces keep an object moving with constant velocity?
- Why do heavy vehicles require a greater braking distance?
- How does friction help us walk safely?
- Why are tyre treads made rough?
- How does lubrication improve the efficiency of machines?
- Why does a loaded truck have greater momentum than a motorcycle moving at the same speed?
- Explain why airbags reduce injuries during accidents.
- Why do action and reaction never cancel each other?
- How are Newton's laws useful in sports and transportation?
10. HOTS Questions
- A bus and a bicycle are moving with the same speed. Which one has greater momentum? Justify your answer.
- Why does a person slip more easily on a wet floor than on a dry floor?
- Explain why a rocket can move upward even though there is no air in space.
- Why does a cricketer move his hands backward while catching a fast ball?
- Can an object move with zero net force? Explain with an example.
- Why do action and reaction forces never balance each other?
- How would life be affected if there were no friction on Earth?
- A body has a large mass but is at rest. Does it have momentum? Give reasons.
- Why is force considered a vector quantity while mass is a scalar quantity?
- How do Newton's laws help engineers design safer vehicles?
All Topics Chapter How Forces Affect Motion
How Forces Affect Motion-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
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